The Ceph Storage Cluster is the foundation for all Ceph deployments.
Based upon RADOS, Ceph
Storage Clusters consist of two types of daemons: a Ceph OSD Daemon
(OSD) stores data as objects on a storage node; and a Ceph Monitor (MON)
maintains a master copy of the cluster map. A Ceph Storage Cluster may contain
thousands of storage nodes. A minimal system will have at least one
Ceph Monitor and two Ceph OSD Daemons for data replication.

Config and Deploy

Ceph Storage Clusters have a few required settings, but most configuration
settings have default values. A typical deployment uses a deployment tool
to define a cluster and bootstrap a monitor. See Deployment for details
on ceph-deploy.